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Question
Study the following flow chart. Name the hormones involved at each stage. Explain their functions.
| Flow chart |
| Hypothalamus |
| ↓ |
| Pituitary |
| ↓ |
| Testes |
| ↓ |
| Sperm |
Explain
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Solution
| Flow chart |
| Hypothalamus |
| GnRHR |
| Pituitary |
| LH and FSH |
| Testes |
| Androgens (Testosterone) |
| Sperm |
- The hypothalamus secretes gonadotropin releasing hormone (GnRH), which stimulates the anterior lobe of the pituitary gland to secrete luteinizing hormone (LH) and follicle stimulating hormone.
- Leydig cells are stimulated by LH, which results in the testes secreting testosterone.
- Sertoli cells in the testes release an androgen-binding protein (ABP) in response to FSH, which concentrates testosterone in seminiferous tubules. It also stimulates the secretion of certain substances that aid in sperm production.
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